oh gosh too long 4 me since i’ve done it (one of several reasons i’m reading “absolutely everything that matters in mathematics in 1001 bite sized expanations” is because I forgot the specifics of a lot of this stuff… and my nephew’s in pre-algebra so I gotta get myself prepared. [that and I’ve always kicked myself for being not willing to “read math” properly].
To me, if you’ve checked your work and it checks out then it checks out. Can you go any simpler? Maybe. I mean there’s two x’s on the left so there’s likely *some* way you can bring the whole thing over 1 and do some trickery that way but I dont remember tbh
My gut says “remember that -1 is the same as + (-1) as a possible clue…